In a recent extension a vinyl potassium trifluoroborate salt was thrown in resulting in a alpha vinyl aldehyde (Kim et al. 2008 DOI) although this blog struggles to understand the dicationic intermediate and the discrete molecule of BF3K expelled for this reaction to work, at least according to the investigators on duty.

Styrene is also found to react with aldehydes in this methodology with the intermediate radical neutralized (after another one-electron reduction to the carbocation ion) by a nitrite ion (Graham et al. DOI).

Reactions of enamine radical cations (as a reactant, not as a catalyst) were first described by Narasaka et al. in 1992 (DOI):

The SOMO organocatalysis concept has not yet attracted support from other research groups other than that of MacMillan himself except perhaps that of the Grimme group as evidenced by a recent 2008 report on aldehydeoxidation in a NHC / TEMPO combo (Quin et al. DOI):
with this fancy mechanism: